Daniel H. Kort, MD, from Columbia University in New York City, and colleagues analyzed data from 16 women with PCOS (18–38 years old) who had been randomly assigned to placebo or cinnamon supplements for six months.

The researchers found that while baseline menstrual cyclicity was similar in both groups, there was a significant improvement in menstrual cyclicity among women taking cinnamon supplements (3.82 vs. 2.2 cycles in six months). Cinnamon supplementation was also associated with a significant increase in menstrual cyclicity from baseline (increase of 1.27 in six months), while there was no change in the placebo group. Ovulatory function was observed in some women taking cinnamon supplements and two women reported spontaneous pregnancies after three months.